Renewable Polyester Fibers having a Low Density
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United States of America Patent
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Jun 17, 2021
app pub date -
Dec 4, 2020
filing date -
Feb 10, 2012
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Abstract
Fibers that are formed from a thermoplastic composition that contains a rigid renewable polyester and has a voided structure and low density are provided. To achieve such a structure, the renewable polyester is blended with a polymeric toughening additive in which the toughening additive can be dispersed as discrete physical domains within a continuous matrix of the renewable polyester. Fibers are thereafter formed and then stretched or drawn at a temperature below the glass transition temperature of the polyester (i.e., “cold drawn”).
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